<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <script type="text/javascript">
            function loadXMLDoc() {
                var xmlhttp;
                if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
                    xmlhttp = new XMLHttpRequest();
                } else {// code for IE6, IE5
                    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                }
                xmlhttp.onreadystatechange = function() {
                    if (xmlhttp.readyState === 4 && xmlhttp.status === 200) {
                        document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
                    }
                }
                xmlhttp.open("GET", "/W001/c001/a001?t=" + Math.random(), true);
                xmlhttp.send();
            }
        </script>
    </head>
    <body>
        <h2>AJAX</h2>
        <button type="button" onclick="loadXMLDoc()">请求数据</button>
        <div id="myDiv"></div>
    </body>
</html>
